I have following data in my table "devices" … I executed below query … It returns result given below … How to come out of this so that it should ignore NULL AND result should be …
Union select null, null, null, null, null, null, null from information_schema.tables. for a small database containing three tables. this instruction is used in sql injection I tried it and it worked but I didn't really know how it works can somebody help me...
...module=department&collegecode=200&deptcode=ELEC' AND (SELECT 8494 FROM(SELECT
A field with a NULL value is a field with no value. If a field in a table is optional, it is possible to insert a new record or update a record without adding a value to this field.
AND(SELECT COUNT(*) FROM (SELECT 1 UNION SELECT null UNION SELECT !1)x GROUP BY CONCAT((SELECT table_name FROM information_schema.tables LIMIT 1),FLOOR(RAND(0)*2))).
1 UNION SELECT * FROM (SELECT * FROM users JOIN users b USING(id,name))a ... Extract data without information_schema.
(select 1 from(select count(*), concat(( select( select unhex(hex
Mapping to and from null. Null Propagates Through Expressions. Null in Aggregate Functions
Эта заметка призвана разобраться, что такое NULL в MySQL и так ли страшен чёрт, как его малюют.